Halekulani Coconut Cake
Preheat oven to 350 degrees.
Combine egg, water and oil; add to sifted ingredients. Mix batter until smooth.
To make pastry cream: Scrape vanilla bean seeds into milk and bring to a boil over moderate heat (add vanilla bean pod to milk as well). Combine sugar, flour and egg yolks; whip until light yellow. Slowly pour 1/3 of the hot milk into the egg mixture to temper it. Add milk-yolk mixture back into the remaining milk and cook over moderate heat, stirring constantly until thick. Immediately remove bean pod and strain, then place in a bowl and cover with plastic wrap. Chill.